Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
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When the brake surface gets to where it feels noticeably concave, I'd replace it.
Everybody reads the tire pressure rateing label, but half of that interface is the rim. If you neglect your rim for too long, you'll blow off a tire, probably at an inopportune time.